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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4797e766d86940cf60fe84bfc7217368e4b164b006e174d1261a846d8a885efa' 
  AND token = 'FS08aq/k2K68ImWbBTCCFgMPd/4w6h+q/mFZC6sSiPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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