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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05d56d6057bbb7b2e5f4bb36c10d655cc33d015366309d09f91bf740fe9411b' 
  AND token = 'L9FzB/hZMT9m1UpKbpkPLY522J8e/AYQHhzSA650Guw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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