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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ce1eb666acf121878ab2222a0b5f5686bd71162f6400607af9a92e8fe59475' 
  AND token = '7eKp6NyDUr3aRmOnoLf3q86K9j4KzaFX94qw10gIm7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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