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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7732842f45d5d9528648002ff8d635164e00faabdc6bd66812fd9df7ec7112af' 
  AND token = 'N2Rs3gCq/LOxS/KpSieVwLLEYk5xrRa905xud+kFiT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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