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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d63f64f5be60a3a287878db54be782e2bbd7bc31672cad0ff44e308e0ee1a6' 
  AND token = '8aEx6itvZ/at38gjEqft/AB/e2FjH6iWPvSntlikrYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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