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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bb6754a8988fcbcfc1e9af659944c86c92c8d782218a155434ccc7e0e30ff4' 
  AND token = '0FBaFZZ+aIGJ+puQXM+7sdaPdLSELWRHjiD4ciB2OP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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