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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de35db056ab553b17198f460110f7d5e71ef30c763e89fc7790eec36a86cdf1a' 
  AND token = 'ke62AvfGUtrK/QbhUaX8mM9ygDLiWKIvdDSzZNOLOak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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