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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd333ba9c60a509b9e7d6bd8ba92c92f814387074353bca07e883cbd624ad57' 
  AND token = 'y/1AKJryT8+1Pde8ZB4pYbw1A6OQtawzZq9ZKTelhNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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