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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e69e276ca93176a0be45988554a1e684146f273602a8e7f71061e13f21c7e6' 
  AND token = 'tsfO5e5yO7HAz0d6ZXhO0KIIQV4DatqpmXHWJDkDKbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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