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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b5966c2628b796607153d8e51a45b31d65e69498e90821d3f9972c864c207b' 
  AND token = '3Xs5lDDKmF2Q0FciLRzyzoIsdjdAUTI7X2Kgr7jeZTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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