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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa239eea45d1ed17326a266c1c534070dcbdaa72efad97d7ef64da09f6e0c41' 
  AND token = 'C+lWsHXk+XkaP35FusqPZZsDkKm2wuol7XDTXmfARbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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