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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64a43e62e2a0986e9fce1a9ff80d6e997a0c2f1b14ff1167f37ced74fff8346' 
  AND token = 'X9y1vewStM9y8dPaXvZeIbUvbCMhb8N9TB77vZbSEAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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