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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aff0a7a3233f1a74ddb6c447fbb476181d69d573bac941b8de0d6d28cc186c8' 
  AND token = 'qUvlPFV2nkWR4hePMYgoEDP9L/exHEp4QJsxrN5SigE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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