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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76753c87dd26e6c8687fbcf892fc8461d0b8c2f260003c3f705233b040789057' 
  AND token = 'OOO/ocU89sAe9qTrz5+Il5dki5ROBYqMlpfUDWzeY1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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