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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ec4c051b967be73aa7eafd9d673927905ff440ad2d8f71799073f4bc6b10c0' 
  AND token = 'LnrFWpz3W2a+mkmGIA5n+W7/EysQWq7KkblvraXaFow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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