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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0006e623cdd1759010f60b03cbd68f54f4da5af3d9c530344c7188439ddbf39' 
  AND token = 'hFAYP9xY/BSFcldKGJq4V8c8ebtwtDExD0CcbJItboo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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