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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980c44a57bcdb64f24b7e1ac08e31d975a8d854e03b50e201d42f874b64e9d7d' 
  AND token = 'wxOdUvH57vW2IkrjcBtyAWedInYP9w0PaBxjc2DFtjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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