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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf47ed22e347cba8ea1696fa7348110c4bba7f94c4be82c57add1577315ab2cb' 
  AND token = 'GMPXGIsOhDSm4AiiKFJj9C6r7ksU+cizIxrniaTneS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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