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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c60a8328349ba2ae47074efb4176d883a01ab27b1c488d4e09951ab41d433b' 
  AND token = 'cwQ4zq4qKaZDCea+aSx7R9ew+PwDhCRKh9dLFhWgqPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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