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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cbb3469220c2bd73ec654d98b66b311dd3e4f5e74006bf72eddbb06953601d' 
  AND token = 'gO/HJwN1LPOEw/M8c3lidWK3o2GNhdnZKLaYJCA6ohk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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