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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0acbf79121f1658aea007094fca53c84edf2664ce857cbb62392e3c967bc160' 
  AND token = 'TfaLamsODTV/KVVOOXUBDWcqgOUYf0zdLbJIu2lY9Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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