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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26410c9b9128016f9dbd1e97d5b5f680b24e4e018b0baf98ba1dac432d8eccc' 
  AND token = 'wnYnq0UseVsnYMESIxHwa9mQcedlUujyqHtn05RUGZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}