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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3839e2002252853e52d7b6217bf65fab8016ff0553765aa98e78b9d01b1363' 
  AND token = 'rjt6/7d3Uoa16I0EFGJOq1ibH3ghl/hY4Yi5adOF3ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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