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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf4f1e8ad81d0178fd151f5a36e024be484b17a86d6420b2e0f375ee38fbcae' 
  AND token = 'rI7EVQbfeHVJHX+kwi8vy0FgaJSb68uqUiUFEl6pHkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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