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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4160ac6efde8fc724b3447d0d5395737dcf67ca836518938fab5d7cd42c82ec' 
  AND token = 'RCgsuYqGgUDX5Mf0vnyGHLc/1fbyzfmIXFIKATE0A8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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