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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a0fff319417110b90533e4077bd44cf1aa16eb7c6b7d04067972dc60647f22' 
  AND token = 'eDnjyvnPSiwR6rWb+D5mRui9wtbsJSGpHeCp0+xwSqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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