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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd218198fa6b46d08ff986c68c0d44a8ab12410a3b3d115d13d45a81bb6ea544' 
  AND token = 'LQlQyljALgkKHL6NOrf6cU0ddD1p6XDgT2TQ5ALKCkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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