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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752fae9139d745fb193ce836e2f43a25dac81890f8f927328a8e0b8364925168' 
  AND token = 'RcSPCqpVlOc9WA5pqlVaeYVzlmeuuCOMzx+rm/pDjR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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