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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07923c5a33e558d9260728ca1edfe9446923fb58cce17e5d7c45702dfd52fbd' 
  AND token = '34klW0TqqVFq9gP/ZT0Op0kg4jBgABoBdsgoeg8kXA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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