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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc99e23541a09622ba510d950da7a09c0a88bf83328951347b9d3590cd2bd056' 
  AND token = '05YlPzAVWx7W+giGVMBdg2fO8QjV9028KDpJLBkyhmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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