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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ea6e40ed5e76d79ae56a4c2585b9c58cfa6b383b98b0f4504f9dd13f9da4c1' 
  AND token = 'FZunNVSvYrwKLkuuL23LoEN8ZRN/w2WY26NC/niQAyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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