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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f317c985475bf1f6c1a84a05e84c50a4a0032f259309547cfac40e0cdecd835b' 
  AND token = '0cJvCQxP6yD31BlJv3GO4emZiagZR/yV68ZXtz9xgAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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