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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e891f12b87212ef1e4842dd9f5e85878d6f497477629e2bd33ed5b213160d7' 
  AND token = '8FBe1+XtwSWPILLHF+FJe9OSMJCcTZbDh7WMlmzh9J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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