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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd267eddb5b94399c100fc30cd18e0ac7ee3ea7b6033b72a576693b9c8fca8780' 
  AND token = 'rDNqkDXPclzv220dDe7F/A2eT6fDNjHQ74Z6NhTkouY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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