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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ee64be845edfa2ecbf13dce5a2a34f08b82b0371e6a800c0aa8b6c7fdb8b23' 
  AND token = 'b9eY333W2nI67J8rSL2t0d2w6PvAzabQhL0AJlbmZeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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