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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12abeab80b87bfb8b7d4acd6e3900da49cabadaa1bc0481c83b8d55d71b063bc' 
  AND token = 'F5vWE/MnMlugwLzOt97LVUbG43INQWHsAsGzMqR3FKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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