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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392d350ed734b026333891c8dd3dbbd2542d0dfb97fa9ebe184e71a2bf4f64c0' 
  AND token = 'g5e1qkGmbtoP1fU0pQXFaVq9JzwD8g1yaoehIhbN3nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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