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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb255e85982496115090be17b6810f353503ded626606fbb3dd00943f2584602' 
  AND token = '9tQy42sFCA4x3EnIjOWJu9JYARq29Oc5lAlRR2dqr6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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