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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e88bab619b0f42b484bbac5d2718c29507e088cccc8e6f69ebae8f225a76963' 
  AND token = 'Jhq+csxbjQ7ACbSINjhL93myiLdJm/L6ZL6jP8Owh5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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