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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f1627f699949761c8b963733194f4177f7ea065bc15add40986c82a06d9b2c' 
  AND token = 'd3FMj3xuUwQVxFutrshQkiIQIFE+GXjVkkt2MggQBuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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