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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908df314ec93abdbfcaf6d1440ab12cc9c30beff202382e969fc1c0c04fceafa' 
  AND token = 'LtpsCGsk387LGX5P8xsOYwzh2gNrXed0KzLMzyWt4Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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