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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15d2d6bf5c09d0a15a090019716f56bb1164bf3e133f211a528d3e5f1a71b7a' 
  AND token = 'kgbCFu/G8dZxElyV1llP/QINiSA5ko1HG978loiG0gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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