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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d3edd72e9346c6d7157646ca33bc91303f12d4c911dca1e45976362a1615d9' 
  AND token = 't8+kroDPtLtG8cDWY1iLrjQjB0KOvpIaodRxnGGoWMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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