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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4bf03688e9c501638e1f9048ac93b467f38a2e81647b304d9845b164218942' 
  AND token = 'cJz8U6DWaUoUek83spi5ShoVS7aS0nweKv1xu1e9xVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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