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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69128cdec881eb55c50fa4ba79e132c72adadfbc2ce73a884e12399f1358b83a' 
  AND token = 'bkzHNwd2RCnfAGoLYR+A7lNwf2k0RosKa3/MF6l2B08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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