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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2324dad8418a4ac7196b7adeb96b7cbd87453206fc9386b88abbe4f11631af17' 
  AND token = 'RnQ8vOfwRaWI2ttnvToG6beg7EG0OGspiYy3U41OP4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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