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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a948591b9b6ddc9f6ac0a6e336709bbab47d61592b22680b61325620c293336' 
  AND token = 'a8Blwb0Uu/J2DuMuHc6nzpPHhm9m7WrffnxeSJSR5jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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