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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25eea43d2a95a33492d7e5a1eb4c8f2d9cbfff201758a253fac3e08c805ef839' 
  AND token = 'BzufVv36Zl176JyeGUHCJMIma6oRiB9m+39ggBir0/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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