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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bae1436d8ee09243b3c1ce0fcacd14e30e1d288b6b3999308bd91e9c5e4713' 
  AND token = 'Dtvi1TVVuSt3Sa6jFnPSxW9MDw0d3UbCxx8bMqSxmYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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