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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b65639c826847128f7565250cc2d8183637c358b3dadcf084d6e9df500293e' 
  AND token = 'hBJw6xIZJlw/oelhSpkkdEyLhIcbgEQ11qxUmgctnqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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