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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cacaf8c7885708494df2c788c4a1033ca51324974df8f322955a049c6fc6e30a' 
  AND token = 'ehvU0SAaSZXCMD3oCa47M+MJVFob5FfWKzrXaBlwaeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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