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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0a93a81720a1258c0099499c67c29ab510e8b53893a94e57e0fedd1d5589c3' 
  AND token = '2jabDB6mD4KCh0l7Zc7SM77rlghncBkefChjtyFdfp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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