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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04769ff18ba07356e9ee53e7ac5be75c68c4f18b5c65145ee0e00ee8023438a' 
  AND token = 'm5HM37mitY9f1UNSofEm3sWiP9JMAeZOa4y1qcAiFyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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