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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01d07926db22fa7649916927709d9e941255a4dc8af506813bf724595d40fd8' 
  AND token = 'YSyg/QXpt0cWmnW6iZrL2+mE+KsMmwHPcI5DKyKfQ1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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