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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95a7e95d503ddb691a42c87e3fa141657543a345f8ff4ae44803e58e6d8d35c' 
  AND token = 'xJP9dR3D8j1h4eEwdgAZtr0KWF3Pwci5bbfWg8n+uBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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