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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b19725135d04c7a905992291887a366efe96a184aad4560e3c06ba2442ddda0' 
  AND token = 'AxRQW/Y0wgx6Dndm3aCaHP9vuqY9LvGs1hxllfCzdps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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