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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58299da9b993433b142ac69dab1fb333b554c922bac8ac1616e386bf44a1b9d6' 
  AND token = 'X5KAeQhBvBV7nZqRrMzsb5buhTpc4OqP7WbSSK7n+9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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