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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7f8f029dabb25b8a63a16b4fc7b3f86fe3a529a9b3fbdf04ad395bce7373c4' 
  AND token = 'Gs91U7cLn3Ohin8an8KRuqVyQiezUB+0u/Z2CLJEybM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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