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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c68b8c54e517bf73ca22f9e54c5e10d7fe26275a48192c681e523a2fbba43fd' 
  AND token = 'qjFqUKQysePinPzf2/PmO8XlxCf07IODD7tvfHPeX3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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