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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc82462eb9ce4cd4d46c05f86330354f463674a587f9ba73cd238af7fab06c5' 
  AND token = 'WYCP2yE/4a2sgfTU+nfmJKkGOFv5WbDNe1kt8jzxPdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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